Nasal filter



FIG. 1 is a front view of a nasal filter showing my new design, a rear view being identical;

FIG. 2 is a left side view of the nasal filter, a right side view being identical;

FIG. 3 is a top view of the nasal filter;

FIG. 4 is a bottom view of the nasal filter; and,

FIG. 5 is a top front side perspective view of the nasal filter in another configuration. 

CLAIM The ornamental design for a nasal filter, as shown and described. 